Perhaps you should try some spelling variations:
day nhanh » duy nhanh, dac nhan, day manh
day thanh » dao thanh, dat thanh, da thanh
cham thuc » nham thuc, pham thuc, tham thuc
khach ky » thanh ky
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
hanh ky » hanh kem
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
de cua » le cua, te cua, dieu cua
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((khach ky) OR (hanh ky)) nang o hoi. hieu ve cham thuc ((day thanh) or (day nhanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khach ky) OR (hanh ky)) nang o hoi. hieu ve cham thuc ((day thanh) OR (day nhanh)) de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khach ky) OR (hanh ky)) nang o hoi. hieu ve cham thuc ((day thanh) or (day nhanh)) de cua tre*".